Furnace.



C. ZULVER.

FURNACE.

APPLICATHJN FILED JUNE 25 I917- 1,270,679. atented June 25, 1918.

2 SHEETS-SHEET 1.

Fig.1.

C. ZULVER.

FURNACE.

APPUCATION F|LED]UNE25. 9I1- 1,270,679. Patented June 25, 1918.

2 SHEETS-SHEET 2.

fig. 3.

UNITE STATES ATENT OFFIQE.

CORNELIS ZULVER, OF LONDON, ENGLAND, ASSIGNOR OF ONE-HALF TO LAUNCELOTEUSTACE SMITH, OF SOUTH SHIELDS, ENGLAND.

FURNACE.

Specification of Letters Patent. Patented J une 25, 1918,

Application filed June 25, 1917. Serial No. 176,854.

To all whom it may concern:

Be it known that I, CORNELIS ZULVER, a subject of the Queen of theNetherlands, residing at St. Helens Court, Great St. Helens, in the cityof London, England, have invented a new and useful Improvement in andRelating to Furnaces, of which the following is a specification.

This invention relates to furnace fronts constructed with a fuel supplyopening having around three sides thereof an air supply passagefurnished with valves for controlling the admission of air, which airissues from the passage through a deflector and flows into the furnacewhere it meets the fuel spray at approximately a right angle.

According to the present invention the air instead of directly issuinginto the furnace passes into the furnace front around the burner orburners and thence flows toward the fuel spray. The air supply iscontrolled by an upper valve which admits it into the air passage whencethe air passes through openings in the top and sides of the inner wallof the passage. Between the ends of the passage and the floor of thefurnace front are two oppositely disposed openings closed by valves ordoors. When burning liquid fuel all the air inlets are opened and whenburning solid fuel the openings in the sides of the air passage areclosed in any suitable manner.

In the accompanying drawing Figure 1 is a view in longitudinal sectionof a boiler furnace provided with the improved construction of furnacefront.

Fig. 2 is a plan view of the furnace front, and

Fig. 3 is a sectional view on the line wm in Fig. 1.

Fig. 4: is a sectional view similar to Fig. 3, but illustrating amodified construction.

The furnace front a is formed with a fuel supply opening 1 around theupper portion of which is an air passage 2. The upper Wall of saidpassage is formed with air-inlets 3 which are opened and closed by aslide 4 operated by means of a handle 5 from the exterior of the furnacefront. In the lower wall of the air passage and opposite to the airinlets 3 are openings 6 through which air enters the fuel opening 1.This lower wall of the air passage 2 is also formed with two oppositelydisposed openings 7, 7, which are closed by doors, 8, 8, fastened bybolts 8*. Below the closed ends of the air passage 2 are two moreoppositely disposed openings 9, 9, formed in the wall of the fuel supplyopening 1 and closed by pivotally mounted doors 10, 10. These doors areopened and closed by means of levers 11, 11, respectively mounted at theextremities of spindles 12, 12, which extend through the door 13 of thefuel supply opening 1, and which spindles are provided with handles 14,1 1, on the outer side of the door 13. On each side of the fuel supplyopening is a valve or damper 15 for controllin the supply of air to theunderside of the re-bars 16; said dampers being opened and closed bymeans of handles 17, 17, on the outer side of the furnace-front. Ahandle 17 of the dampers 15 and the handle 5 of the slide 4 may beinter-connected, as shown on the one side in Fig. 2, by links 5, 17, toa bell crank lever 19, so that the opening and closin of the slide andthe dampers may be efiected simultaneously. This insures a more suitabledistribution and admission of air into the fire-opening, thus promotingcombustion. Moreover, the simultaneous closure of all the air valvesprevents the admission of air when the burners are shut off, therebyavoiding damage to the boiler. The links 5, l7, and the lever 19 may beeither on the outside or the inside of the front plate.

The liquid fuel burner or burners 18 is or are mounted upon the door 13of the fuel supply opening, and when burning liquid fuel all the airinlets 3 and the openings 7 and 9 are opened to supply air for admixturewith the fuel.

When it is desired to burn solid fuel the door 13 with the burnersthereon is removed and replaced by a fire-door of the usual type. Theair inlet openings 7 and 9 are closed and the dampers 15 are opened.

Fig. 4 illustrates an alternative design in which the air passage 2around the fire-opening is continued to the floor of the furnacefrontwhere additional air openings 20 are made. In this case, the airadmission into the fire opening from the air passage 2 is controlled bythe slide 41, while the air through the floor of the furnace front iscontrolled by the valves 15, and the slide and the valves are connectedtogether as previously described. When burning coal all Gopies of thispatent may be obtained for openings, a handle on the exterior of thefurnace for operating said slide, dampers for controlling the supply ofair to the under sides of the furnace'grates, handles for op eratingsaid dampers, a bell-crank lever, and

links connecting said slide handle and a damper handle to besimultaneously operated from said bell-crank lever, substantially asdescribed CORNELIS ZULV ER.

five cents each, by addressing the Commissioner of Patents, Washington,D. G.

